diff --git a/telethon/sessions/sqlite.py b/telethon/sessions/sqlite.py
index c764cd21..1170131e 100644
--- a/telethon/sessions/sqlite.py
+++ b/telethon/sessions/sqlite.py
@@ -198,7 +198,7 @@ class SQLiteSession(MemorySession):
             # multiple DCs. Probably done differently.
             c.execute('delete from sessions')
             c.execute('insert or replace into sessions values (?,?,?,?)', (
-                self._dc_id,
+                self._dc_id or 0,
                 self._server_address,
                 self._port,
                 self._auth_key.key if self._auth_key else b''